"""
input:
list of features
output:
the idf value for each features
output tf/tfidf file
"""

def getidfvalues(veclist):
    """
    @param veclist
    @return idf for each of the list
    """
    

def gettfidfvalues(veclist):
    """
    @param veclist may be not integer,the meaning of zero is not changed
    @return the tfidf value
    """
    idf = getidfvalues(veclist)
    
